Lakes / Illinois / McHenry County / Wonder Lake
Wonder Lake, Illinois
697.58 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
42.39 degrees N, 88.35 degrees W - McHenry County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Wonder Lake Stacks Up
- Larger than 89% of the 511 lakes counted in Illinois.
- About 39 miles from Rockford, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| McCullom Lake | McHenry | 3.7 mi | 241.92 acres |
| Wold Lake | McHenry | 3.8 mi | 65.24 acres |
| Pistakee Lake | McHenry | 7.9 mi | 1,743.58 acres |
| Defiance Lake | McHenry | 8.0 mi | 66.22 acres |
| Lily Lake | McHenry | 8.5 mi | 95.88 acres |
| Dunns Lake | Lake | 8.8 mi | 66.97 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Wonder Lake
How Big Is Wonder Lake?
Wonder Lake covers 697.58 acres in McHenry County, Illinois.
What Is the Largest Lake in McHenry County?
Pistakee Lake is the largest lake in McHenry County, at 1,743.58 acres.
Largest Lakes in Illinois
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Carlyle Lake | Clinton | 22,796.77 acres | - |
| 2 | Mine Number 21 Reservoir | Franklin | 17,062.04 acres | - |
| 3 | Upper Peoria Lake | Woodford | 15,460.64 acres | - |
| 4 | Lake Shelbyville | Shelby | 10,235.1 acres | - |
| 5 | Crab Orchard Lake | Williamson | 7,292.57 acres | - |
All 511 Illinois lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 121625323). Verified October 30, 2026.